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      1 /*
      2  * Copyright (c) 2016, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.car.hvac.ui;
     17 
     18 import android.content.Context;
     19 import android.content.res.Resources;
     20 import android.graphics.drawable.Drawable;
     21 import android.support.annotation.IntDef;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 import android.widget.ImageView;
     25 import com.android.car.hvac.R;
     26 
     27 /**
     28  * A seat warmer button that has 3 heating levels.
     29  */
     30 public class SeatWarmerButton extends ImageView {
     31     public static final int HEAT_OFF = 0;
     32     public static final int HEAT_LEVEL_ONE = 1;
     33     public static final int HEAT_LEVEL_TWO = 2;
     34     public static final int HEAT_LEVEL_THREE = 3;
     35 
     36     public interface SeatWarmerButtonClickListener{
     37         void onSeatWarmerButtonClicked(@HeatingLevel int level);
     38     }
     39 
     40     @IntDef({HEAT_OFF, HEAT_LEVEL_ONE, HEAT_LEVEL_TWO, HEAT_LEVEL_THREE})
     41     public @interface HeatingLevel {}
     42 
     43     private @HeatingLevel int mCurrentHeatSetting;
     44 
     45     private final Drawable mStateDrawables[] = new Drawable[4];
     46 
     47     private SeatWarmerButtonClickListener mListener;
     48 
     49     public SeatWarmerButton(Context context) {
     50         super(context);
     51         init();
     52     }
     53 
     54     public SeatWarmerButton(Context context, AttributeSet attrs) {
     55         super(context, attrs);
     56         init();
     57     }
     58 
     59     public SeatWarmerButton(Context context, AttributeSet attrs, int defStyleAttr) {
     60         super(context, attrs, defStyleAttr);
     61         init();
     62     }
     63 
     64     private void init() {
     65         Resources res = getResources();
     66         mStateDrawables[0] = res.getDrawable(R.drawable.ic_seat_heat_off);
     67         mStateDrawables[1] = res.getDrawable(R.drawable.ic_seat_heat_level_1);
     68         mStateDrawables[2] = res.getDrawable(R.drawable.ic_seat_heat_level_2);
     69         mStateDrawables[3] = res.getDrawable(R.drawable.ic_seat_heat_level_3);
     70 
     71         setOnClickListener(new OnClickListener() {
     72             @Override
     73             public void onClick(View v) {
     74                 mCurrentHeatSetting = getNextHeatSetting(mCurrentHeatSetting);
     75                 Drawable d = getDrawableForState(mCurrentHeatSetting);
     76                 setImageDrawable(d);
     77                 if (mListener != null) {
     78                     mListener.onSeatWarmerButtonClicked(mCurrentHeatSetting);
     79                 }
     80             }
     81         });
     82     }
     83 
     84     public void setSeatWarmerClickListener(SeatWarmerButtonClickListener listener) {
     85         mListener = listener;
     86     }
     87 
     88     public void setHeatLevel(@HeatingLevel int level) {
     89         mCurrentHeatSetting = level;
     90         setImageDrawable(getDrawableForState(mCurrentHeatSetting));
     91     }
     92 
     93     private Drawable getDrawableForState(@HeatingLevel int level) {
     94         switch (level) {
     95             case HEAT_LEVEL_ONE:
     96                 return mStateDrawables[1];
     97             case HEAT_LEVEL_TWO:
     98                 return mStateDrawables[2];
     99             case HEAT_LEVEL_THREE:
    100                 return mStateDrawables[3];
    101             case HEAT_OFF:
    102             default:
    103                 return mStateDrawables[0];
    104         }
    105     }
    106 
    107     private @HeatingLevel int getNextHeatSetting(@HeatingLevel int level) {
    108         switch (level) {
    109             case HEAT_OFF:
    110                 return HEAT_LEVEL_ONE;
    111             case HEAT_LEVEL_ONE:
    112                 return HEAT_LEVEL_TWO;
    113             case HEAT_LEVEL_TWO:
    114                 return HEAT_LEVEL_THREE;
    115             case HEAT_LEVEL_THREE:
    116                 return HEAT_OFF;
    117             default:
    118                 return HEAT_OFF;
    119         }
    120     }
    121 }
    122